Evidence for dopamine 'D1-like' receptor subtypes in the behavioural effects of two new selective antagonists, LY 270411 and BW 737C.

Abstract

A new, chemically distinct antagonist at dopamine 'D1-like' receptors, the thienoazepine LY 270411, ([+]-2(3-chloro-6-methyl-8-phenyl-5,6,7,8 -tetrahydro-4H-thieno[2,3d]azepin-2-yl)propan-2-ol) was compared with the isoquinoline BW 737C ([S]-6-chloro-1-[2,5-dimethoxy-4- propylbenzyl]-7-hydroxy-2-methyl-1,2,3,4-tetrahydroisoquinoline) and the benzazepine SCH 23390 ([R]-7-chloro-8-hydroxy-2,3,4,5-tetrahydro-3-methyl-1-phenyl-1 H-3-benzazepine) for effects on behavioural responses to the isochroman full efficacy dopamine 'D1-like' receptor agonist A 68930 ([1R,3S]-1-aminomethyl-5, 6-dihydroxy-3-phenylisochroman) vs. the dopamine 'D2-like' receptor agonist RU 24213 (N-n-propyl-N-phenylethyl-p-3-hydroxyphenylethylamine). Grooming responses to A 68930 were readily blocked by each of LY 270411, BW 737C and SCH 23390; however, the vacuous chewing response was blocked only by BW 737C. Sniffing and locomotor responses to RU 24213 were attenuated by BW 737C and SCH 23390 but not by LY 270411; furthermore, myoclonic jerking to RU 24213 was released by BW 737C and SCH 23390 but not by LY 270411. These findings indicate that grooming induced by dopamine 'D1-like' receptor agonism is blocked by all chemical classes of dopamine 'D1-like' receptor antagonist while vacuous chewing is blocked only by isoquinoline dopamine 'D1-like' receptor antagonism; this suggests that these behaviours may be mediated via functionally and pharmacologically distinct subtypes of dopamine 'D1-like' receptor. Furthermore, LY 270411 appears unique in its activity to readily block 'D1-like' receptor agonist-induced grooming without influencing behavioural responses to dopamine 'D2-like' receptor agonism; thus, the site mediating prototypical dopamine 'D1-like' receptor agonist-induced behaviours may be dissociable pharmacologically from dopamine 'D1-like' site(s) participating in functional interactions with dopamine 'D2-like' receptors.

• Authors: A M Deveney, J L Waddington
• Journal: European journal of pharmacology (Eur J Pharmacol) Vol. 317 Issue 2-3 Pg. 175-81 (Dec 19 1996) ISSN: 0014-2999 [Print] Netherlands
• PMID: 8997598 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Azepines
• Chromans
• Dopamine Agonists
• Dopamine Antagonists
• Isoquinolines
• LY 270411
• Phenethylamines
• Receptors, Dopamine D1
• Receptors, Dopamine D2
• Tetrahydroisoquinolines
• BW 737C89
• Spiperone
• N-n-propyl-N-phenylethyl-4(3-hydroxyphenyl)ethylamine hydrochloride
• A 68930

Topics

• Animals
• Azepines (pharmacology)
• Behavior, Animal (drug effects)
• Chromans (pharmacology)
• Dopamine Agonists (pharmacology)
• Dopamine Antagonists (pharmacology)
• Grooming (drug effects)
• Isoquinolines (pharmacology)
• Male
• Motor Activity (drug effects)
• Phenethylamines (pharmacology)
• Radioligand Assay
• Rats
• Rats, Sprague-Dawley
• Receptors, Dopamine D1 (antagonists & inhibitors)
• Receptors, Dopamine D2 (agonists)
• Spiperone (metabolism)
• Stereotyped Behavior (drug effects)
• Tetrahydroisoquinolines